From: "J. Bruce Fields" bfields@redhat.com
This patch has been added to the 4.1 stable tree. If you have any objections, please let us know.
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[ Upstream commit 1b8d97b0a837beaf48a8449955b52c650a7114b4 ]
If some of the WRITE calls making up an O_DIRECT write syscall fail, we neglect to commit, even if some of the WRITEs succeed.
We also depend on the commit code to free the reference count on the nfs_page taken in the "if (request_commit)" case at the end of nfs_direct_write_completion(). The problem was originally noticed because ENOSPC's encountered partway through a write would result in a closed file being sillyrenamed when it should have been unlinked.
Signed-off-by: J. Bruce Fields bfields@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust trond.myklebust@primarydata.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- fs/nfs/direct.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 38678d9a5cc4..cb050d1e8146 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -784,10 +784,8 @@ static void nfs_direct_write_completion(struct nfs_pgio_header *hdr)
spin_lock(&dreq->lock);
- if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) { - dreq->flags = 0; + if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) dreq->error = hdr->error; - } if (dreq->error == 0) { nfs_direct_good_bytes(dreq, hdr); if (nfs_write_need_commit(hdr)) {